Developer Tool
RegexTester
Test regular expressions, experiment with patterns, and instantly highlight matches in your text.
Quick Examples
Regular Expression Tool
Test Your Regex Pattern
Enter a regular expression pattern and test it against your text. Matching content is highlighted automatically.
Regex Flags
g = Global · i = Ignore Case · m = Multiline · s = Dot All
Test String
Enter the text you want to test.
Match Results
Matching text is highlighted below.
Features
Test Regex Patterns Faster
Build and test regular expressions with instant results and highlighted matches.
Live Results
See regex matches update instantly as you change your pattern.
Match Highlighting
Matching content is clearly highlighted for easier analysis.
Regex Flags
Test global, case-insensitive, multiline, and dot-all matching.
Browser Based
Your regex patterns and test data remain in your browser.
About Regular Expressions
What Is a Regular Expression?
A regular expression, often called regex, is a sequence of characters that defines a search pattern. It can be used to find, validate, extract, or replace specific text.
Regular expressions are commonly used in programming, form validation, data extraction, search operations, and text processing.
This Regex Tester allows you to experiment with patterns and immediately see which parts of your text match the expression.
Quick Guide
How to Test a Regular Expression
Enter a Pattern
Add your regular expression pattern without the surrounding slash characters.
Add Test Text
Paste or type the text you want your regex pattern to search.
Review Matches
Review highlighted matches and copy the matched values if needed.
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